DISTRIBUTION LAW OF IN-SITU STRESS FIELD IN ENGINEERING SUBZONE OF DEEP COAL MINE AND APPLICATION IN FORECAST OF OUTBURST

This paper studied the deep diggings of ZhangXiaolou coal mine XuZhou which the distance between coal seams of the research area and floor is over 1200m. On the base of analyzing the macroscopical in-situ stress field, the paper tested the in-situ stress of terranes and the rule that in-site stress transformation following depth was concluded. The paper also put forward a practical method which can be used to preliminarily estimate in-situ stress value in strata.The paper made use of nonlinear finite element program calculating the horizontal section and two vertical section of typical mining level. On this condition, the paper tested and analyzed the energy liability to rock burst of the mostly coal seams. The paper appraised outburst fatalness zone of main coal seam in research area. The content was important to future safety production of the coal mine. Moreover the whole research method had wide guiding significance for other deep coal mine level.